1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ 2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */ 3 /* This Source Code Form is subject to the terms of the Mozilla Public 4 * License, v. 2.0. If a copy of the MPL was not distributed with this 5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ 6 7 #ifndef __mozilla_layers_TouchActionHelper_h__ 8 #define __mozilla_layers_TouchActionHelper_h__ 9 10 #include "mozilla/layers/LayersTypes.h" // for TouchBehaviorFlags 11 #include "RelativeTo.h" // for RelativeTo 12 13 class nsIFrame; 14 class nsIWidget; 15 16 namespace mozilla { 17 namespace layers { 18 19 /* 20 * Helper class to figure out the allowed touch behavior for frames, as per 21 * the touch-action spec. 22 */ 23 class TouchActionHelper { 24 public: 25 /* 26 * Performs hit testing on content, finds frame that corresponds to the aPoint 27 * and retrieves touch-action css property value from it according the rules 28 * specified in the spec: 29 * http://www.w3.org/TR/pointerevents/#the-touch-action-css-property. 30 */ 31 static TouchBehaviorFlags GetAllowedTouchBehavior( 32 nsIWidget* aWidget, RelativeTo aRootFrame, 33 const LayoutDeviceIntPoint& aPoint); 34 }; 35 36 } // namespace layers 37 } // namespace mozilla 38 39 #endif /*__mozilla_layers_TouchActionHelper_h__ */ 40